A Study of e+e Annihilation into Hadrons in the 1400–2200 MeV Energy Range with the Magnetic Detector DM1 at DCI: Observation and Study of a φ′ Vector Meson

  • J. Perez-Y-Jorba
  • J-C. Bizot
  • D. Bisello
  • J. Buon
  • A. Cordier
  • B. Delcourt
  • I. Derado
  • L. Fayard
  • F. Mané
  • J-L. Bertrand
  • P. Eschstruth
  • J. Jeanjean
  • M. Jeanjean
  • J-C. Parvan
  • M. Ribes
  • F. Rumpf
  • J. Layssac
Part of the The Subnuclear Series book series (SUS, volume 18)

Abstract

The e+e- annihilation into hadrons has been studied for \(1.4\, < \,\sqrt {\text{S}} \, < \,2.2\) GeV. The total integrated luminosity was 1500 nb-1 over the whole energy range. Accurate magnetic analysis of charged particle momenta allowed a constrained kinematical reconstruction of events with at most one neutral missing.

Cross-sections are given for production of the following exclusive channels: π+π+ππ (including ρº π+π), π+π+πππº (including ωπ+π), K+K \({\text{K}}_{\text{S}}^{\text{o}}{\text{K}}_{\text{L}}^{\text{o}},{\mkern 1mu} {\text{K}}_{\text{S}}^{\text{o}}{K^\pm }{\pi ^ \mp }\) (including ρº π+π), π+π+πππº (including ωπ+π), K+K, K S o K L o , S o K± (including K*Kπ). The inclusive result concerns the production of \({\text{K}}_{\text{S}}^{\text{o}}\).

The ρ′ (1.55) is observed in the 4 π± channel with high statictics. A small bump in the ωπ+π channel is observed near 1.65 GeV with a height 6.7 standard deviation above background. The rather high cross-section \(K\bar K\pi \) production in the same region and the dynamics of this channel, exhibiting an I = 0, I = 1 interference, show that this bump is due to a new φ’ vector meson rather than to an ω′. This new φ′ (1.65 GeV) has a 150 MeV width and decays mainly in KK*.

Keywords

Mane Reso 

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Copyright information

© Plenum press, New York 1983

Authors and Affiliations

  • J. Perez-Y-Jorba
    • 1
  • J-C. Bizot
    • 1
  • D. Bisello
    • 1
  • J. Buon
    • 1
  • A. Cordier
    • 1
  • B. Delcourt
    • 1
  • I. Derado
    • 1
  • L. Fayard
    • 1
  • F. Mané
    • 1
  • J-L. Bertrand
    • 1
  • P. Eschstruth
    • 1
  • J. Jeanjean
    • 1
  • M. Jeanjean
    • 1
  • J-C. Parvan
    • 1
  • M. Ribes
    • 1
  • F. Rumpf
    • 1
  • J. Layssac
    • 2
  1. 1.Laboratoire de l’Accélérateur LinéaireOrsayFrance
  2. 2.Laboratoire de Physique MathématiqueUSTLMontpellierFrance

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